Hi! The option 'Show Mainbody on Frontpage' in JSN Dome (even the latest build) does NOT work in a case with a multilingual site. Really this can affect ALL JoomlaShine templates, I haven't checked
I wanna share my experience, how this can be corrected, using Joomla docs.
I changed in \includes\jsn_setup.php the lines at ~ line#133
$not_homepage = ($menu != $menus->getDefault());
Now my bilingual site respects the mentioned option.
$lang = JFactory::getLanguage();
$not_homepage = ($menu != $menus->getDefault( $lang->getTag() ));